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Front #74

ABTH 100.10B

Before or during a Class 1 air brake test, inspect the retaining valves and verify that they are in: Select the best answer.


  1. High pressure
  2. Exhaust
  3. Slow direct
  4. Low pressure
Back #74
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ABTH 100.10B


Answer: Exhaust
Feedback:
If the retaining valves are not in the exhaust position, the brakes will remain applied when the automatic brake valve is placed in Release. Exhaust position allows all of the air in the brake cylinder to dissipate thus releasing the brakes. In addition to verifying the position of the retaining valves, inspect angle cocks, air hoses, and the system for any leakage.